Latency in dataguard !!!

Question

Hi ,
How can I get the time it takes (latency) for the primary instance to get an archive log over to the physical standby instance and get it "archived" and "applied".
Any ideas on how I can get the latency info I'm looking for?
is latency value should be defined for dataguard?
Thanks
JP

Answer 1

You can use ping to check latency.
Below is an example i found from IBM.
During the process, ping can monitor the time it takes to send and receive the response, which can be an effective method of measuring the response time of the echo process. In the simplest form, you can send an echo request to a host and find out the response time
Listing 1. Using ping to determine latency
$ ping example
PING example.example.pri (192.168.0.2): 56 data bytes
64 bytes from 192.168.0.2: icmp_seq=0 ttl=64 time=0.169 ms
64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=0.167 ms
^C
--- example.example.pri ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.167/0.168/0.169/0.001 ms
On Solaris and AIX®, you need to use the -s option to send more than one echo packet and get the timing information. For getting baseline figures, you can use the -c option (on Linux®) to specify the count. On Solaris/AIX, you must specify the packet size (the default is 56 bytes), and the number of packets to send so that you do not have to manually terminate the process. You can then use this to extract the timing information automatically (see Listing 2).
Listing 2. Specifying the packet size when using ping on Solaris/AIX
$ ping -s example 56 10
PING example: 56 data bytes
64 bytes from example.example.pri (192.168.0.2): icmp_seq=0. time=0.143 ms
64 bytes from example.example.pri (192.168.0.2): icmp_seq=1. time=0.163 ms
64 bytes from example.example.pri (192.168.0.2): icmp_seq=2. time=0.146 ms
64 bytes from example.example.pri (192.168.0.2): icmp_seq=3. time=0.134 ms
64 bytes from example.example.pri (192.168.0.2): icmp_seq=4. time=0.151 ms
64 bytes from example.example.pri (192.168.0.2): icmp_seq=5. time=0.107 ms
64 bytes from example.example.pri (192.168.0.2): icmp_seq=6. time=0.142 ms
64 bytes from example.example.pri (192.168.0.2): icmp_seq=7. time=0.136 ms
64 bytes from example.example.pri (192.168.0.2): icmp_seq=8. time=0.143 ms
64 bytes from example.example.pri (192.168.0.2): icmp_seq=9. time=0.103 ms
----example PING Statistics----
10 packets transmitted, 10 packets received, 0% packet loss
round-trip (ms) min/avg/max/stddev = 0.103/0.137/0.163/0.019